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When accretion is as vital as extreme: from massive young stars to binary black holes


AGENDA Séminaire Lagrange Nice - Mont Gros
mardi 13 juin 2023 - 10:30 mardi 13 juin 2023 - 11:30

When accretion is as vital as extreme: from massive young stars to binary black holes

Raphael Mignon-Risse (APC Paris) - hybrid seminar (in-person in Salle NEF + remote via Zoom)

Abstract:
Accretion is vital for understanding the properties of a number of astrophysical objects, including massive young stars and black holes. For the former, accretion drives the stellar mass growth and multiplicity through gas fragmentation. It also powers strong outflows that regulate the interstellar medium. For black holes, accretion is the main source of luminosity allowing an electromagnetic detection. Hence, the era of multi-messenger astronomy, for which the loudest sources of gravitational waves, binary black holes, are playing a central role, eventually depends on the physics of accretion around such systems.

In this talk, I will highlight some of my work in these two fields: massive star formation, focusing on the formation of binary massive stars (i.e. progenitors of some stellar-mass binary black hole systems) and pre-merger binary black holes, via numerical simulations. I will show how such a priori different systems can be studied with similar techniques.

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